iOS Silent APNS push notification does not go thru

Nick Renzhiglov 1

Hi there
I am experiencing the Apns silent background notification sent with pushtype="background", priority="5", contentavailable=true never reaches the phone. I expect the DidReceiveRemoteNotification triggers but the break point on that line never stops. Additionally, my Azure Service bus explorer does not encounter it as Dead-letter so it seems to get thru.

I can see the notification comes thru' if pushtype="alert", priority="5" in foreground mode. It shows up the message on the message tray yet DidReceiveRemoteNotification do not trigger either. But at least it gets thru'

How to isolate if it is due to not well-formed message json for silent mode or wrong event wiring the phone side?

My info.plist keeps

<key>UIBackgroundModes</key>  
	<array>  
		<string>location</string>  
		<string>fetch</string>  
		<string>remote-notification</string>  
		<string>processing</string>  
	</array>

iPhone 11, software version 15.3.1

Thanks

Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 31,976 Reputation points Microsoft Vendor

2022-08-30T07:08:33.897+00:00

Hi @Nick Renzhiglov , you said "my Azure Service bus explorer does not encounter it as Dead-letter so it seems to get thru.", so the server side is correct. Please make sure you are registered with APNS.
You can check if you have added the aps-environment key to Entitlements.plist. You are debugging the app and set breakpoints, so the value should be development. For more details, you can refer to Enhanced User Notifications in Xamarin.iOS - Xamarin | Microsoft Learn and Working with entitlements in Xamarin.iOS - Xamarin | Microsoft Learn.
In addition, you could check if you are using the correct Provisioning Profile, and determine whether you are using a development or production certificate. For more details, please see Push Notifications in iOS - Xamarin | Microsoft Learn
Nick Renzhiglov 1 Reputation point

2022-08-30T12:44:45.837+00:00

Hi there and thanks for feedback.
The conditions you mention are met since I can see the break point stop for Foreground message in

WillPresentNotification

event. Foreground messages go through Ok with all breakpoints triggered.
Thoughts?
Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 31,976 Reputation points Microsoft Vendor

2022-08-31T08:46:19.653+00:00
As described in the doc- Local and Remote Notification Programming Guide: Creating the Remote Notification Payload (apple.com): To support a background update notification, make sure that the payload’s aps dictionary includes the content-available key with a value of 1. If there are user-visible updates that go along with the background update, you can set the alert, sound, or badge keys in the aps dictionary, as appropriate. You could check if you have set content-available in your message json, like the code below:

{ aps = { "content-available" : 1, ...... }; }

And iOS gives it up to 30 seconds to run, you could check if it times out.
Nick Renzhiglov 1 Reputation point

2022-08-31T15:48:30.707+00:00
Hi WenyanZhang.
It looks like something is wrong with my phone setup. My json works Ok for other phone (DeviceToken) but not for mine (the code base is the same, shared with git). What I checked:

My iphone Settings, my app, Notifications, Allow Notifications is ON

My app, Background App Refresh is ON

In code UNUserNotificationCenter.Current.GetNotificationSettings is as following: AlertSetting, BadgeSetting are ON, AuthorizationStatus=Authorized

May be something in iphone, Settings, Developer settings? Something on Mac mini which I use for building (it is my Xamarin project)?
Thanks
Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 31,976 Reputation points Microsoft Vendor

2022-09-01T09:12:41.14+00:00

The DeviceToken is unique for each iOS device, if it works on other devices than yours, you could check if your Device Token has changed or expired. The device token may change after you update your system, uninstall apps, change Settings, etc. For more details, you can see Registering with APNS.
But you said you can receive the Foreground message, this proves that the Device Token is valid. You could check what is the difference between your device and another device system and whether you have Focus Mode turned on.

You could also add a breakpoint at Application:didFinishLaunchingWithOptions:, and check if it can be triggered. And you can check if you set UNUserNotificationCenter.Current.Delegate, then check if the application:didReceiveRemoteNotification:fetchCompletionHandler: method is triggered.
Because you can't receive the notifications in the DidReceiveRemoteNotification method under background mode. As described in Apple's Doc - Unlike the application:didReceiveRemoteNotification: method, which is called only when your app is running in the foreground, the system calls this method when your app is running in the foreground or background

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iOS Silent APNS push notification does not go thru

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